First, I noticed that all 4 USB sticks were unusually hot. After 2 sticks are now recognized only on my home PC and nowhere else (despite formatting) and is no longer recognized, I'm pretty disappointed.
Stand now stayed several times at DM to let develop photos and to any printer my data found. The computer at work is partly not even the stick itself.
Use again my 3-4 year old little CnMemory sticks that still work perfectly ..